Not sure exactly how this happens but it does from time to time.
Multiple rhino instances open, two screens, windows in sleep mode.
Since there’s no way to fix this bug, maybe the option to manually save the UI at any time, and reload it (also manually, from any Rhino instance) would be a good workaround.
Hi Dave - V8 can save the current toolbar and panels layout as is on screen - this feature is not 100% done currently because it does not save the contents of, for example, new buttons or macros that do not already exist, say on another users’ installation; only the layout on screen, but I think when it is all done you should get both.